Annual report pursuant to Section 13 and 15(d)

Note 18 - Employee Benefit Plans (Details Textual)

v3.22.0.1
Note 18 - Employee Benefit Plans (Details Textual)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
USD ($)
shares
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2025
May 05, 2016
shares
Deferred Compensation Arrangement with Individual, Percentage of Salary, Maximum Defer 75.00%        
Deferred Compensation Plan Assets $ 48,000 $ 44,000      
Deferred Compensation Arrangement, Compensation Expense $ 1,000 1,000 $ 1,000    
Huntsman Corporation 2016 Stock Incentive Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) | shares         8,200
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) | shares 7,000        
Huntsman Corporation Stock Incentive Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) | shares         0
UNITED STATES          
Defined Contribution Plan, Cost $ 26,000 $ 20,000 21,000    
Money Purchase Pension Plan [Member] | UNITED STATES          
Defined Contribution Plan, Employer Non-discretionary Contribution, Percent 8.00%        
Maximum [Member] | Salary Deferral Plan for New Hires [Member] | UNITED STATES          
Defined Contribution Plan, Employer Non-discretionary Contribution, Percent 6.00%        
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay 4.00%        
Defined Contribution Plan, Employer Contribution, Percent of Employees' Gross Pay 10.00%        
Maximum [Member] | Money Purchase Pension Plan [Member] | UNITED STATES          
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay 4.00%        
Pension Plan [Member]          
Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year 6.00% 6.25%      
Defined Benefit Plan, Accumulated Benefit Obligation $ 3,314,000 $ 3,585,000      
Defined Benefit Plan, Plan Assets, Amount, Ending Balance 3,200,000 3,100,000      
Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member]          
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Assets Transferred into (out of) Level 3 0        
Pension Plan [Member] | Forecast [Member]          
Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year       5.00%  
Pension Plan [Member] | UNITED STATES          
Defined Benefit Plan, Plan Assets, Amount, Ending Balance $ 925,000 $ 866,000 $ 790,000    
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets 7.52% 7.52% 7.52%    
Pension Plan [Member] | UNITED STATES | Fair Value, Inputs, Level 3 [Member]          
Defined Benefit Plan, Plan Assets, Amount, Ending Balance $ 12,000 $ 62,000      
Pension Plan [Member] | Minimum [Member]          
Defined Benefit Plan, Cash Balance, Plan Annual Pay Credits, Percentage of Eligible Pay 6.00%        
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets 4.89%        
Pension Plan [Member] | Maximum [Member]          
Defined Benefit Plan, Cash Balance, Plan Annual Pay Credits, Percentage of Eligible Pay 12.00%        
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets 7.52%        
Other Postretirement Benefits Plan [Member]          
Number Of Fully Insured Medicare Part D Plans 2        
Other Postretirement Benefits Plan [Member] | UNITED STATES          
Defined Benefit Plan, Plan Assets, Amount, Ending Balance $ 0 $ 0 $ 0